yah, this is like the todo app of content management, being able to change the text (and perhaps add bold and some links), and has probably been built thousands of times by now in the short history of the web. building in-place editing for fixed text nodes isn't that hard, whatever the underlying toolkit. a CMS should be able to do that in its sleep. it's when you get beyond text into other media and into layout, spacing, color systems, and dragging-and-dropping arbitrarily interleaved blocks of those things where it actually gets useful (and impressive).